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95e6d268 MD |
1 | /* |
2 | * Copyright (C) 2016 Mathieu Desnoyers <mathieu.desnoyers@efficios.com> | |
3 | * | |
4 | * This library is free software; you can redistribute it and/or | |
5 | * modify it under the terms of the GNU Lesser General Public | |
6 | * License as published by the Free Software Foundation; version 2.1 of | |
7 | * the License. | |
8 | * | |
9 | * This library is distributed in the hope that it will be useful, | |
10 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
11 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
12 | * Lesser General Public License for more details. | |
13 | * | |
14 | * You should have received a copy of the GNU Lesser General Public | |
15 | * License along with this library; if not, write to the Free Software | |
16 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA | |
17 | */ | |
18 | ||
19 | #define _GNU_SOURCE | |
20 | #define _LGPL_SOURCE | |
21 | #include <limits.h> | |
22 | #include <stdio.h> | |
23 | #include <sys/types.h> | |
24 | #include <unistd.h> | |
25 | #include <ust-fd.h> | |
26 | #include <dlfcn.h> | |
27 | ||
28 | #include <helper.h> | |
29 | #include "usterr-signal-safe.h" | |
30 | ||
95e6d268 | 31 | static int (*__lttng_ust_fd_plibc_close)(int fd); |
52a20dc7 | 32 | static int (*__lttng_ust_fd_plibc_fclose)(FILE *stream); |
95e6d268 MD |
33 | |
34 | static | |
35 | int _lttng_ust_fd_libc_close(int fd) | |
36 | { | |
37 | if (!__lttng_ust_fd_plibc_close) { | |
38 | __lttng_ust_fd_plibc_close = dlsym(RTLD_NEXT, "close"); | |
39 | if (!__lttng_ust_fd_plibc_close) { | |
40 | fprintf(stderr, "%s\n", dlerror()); | |
41 | return -1; | |
42 | } | |
43 | } | |
44 | return lttng_ust_safe_close_fd(fd, __lttng_ust_fd_plibc_close); | |
45 | } | |
46 | ||
52a20dc7 MD |
47 | static |
48 | int _lttng_ust_fd_libc_fclose(FILE *stream) | |
49 | { | |
50 | if (!__lttng_ust_fd_plibc_fclose) { | |
51 | __lttng_ust_fd_plibc_fclose = dlsym(RTLD_NEXT, "fclose"); | |
52 | if (!__lttng_ust_fd_plibc_fclose) { | |
53 | fprintf(stderr, "%s\n", dlerror()); | |
54 | return -1; | |
55 | } | |
56 | } | |
57 | return lttng_ust_safe_fclose_stream(stream, | |
58 | __lttng_ust_fd_plibc_fclose); | |
59 | } | |
60 | ||
95e6d268 MD |
61 | int close(int fd) |
62 | { | |
63 | return _lttng_ust_fd_libc_close(fd); | |
64 | } | |
65 | ||
52a20dc7 MD |
66 | /* |
67 | * Note: fcloseall() is not an issue because it fcloses only the | |
68 | * streams it knows about, which differs from the problems caused by | |
69 | * gnulib close_stdout(), which does an explicit fclose(stdout). | |
70 | */ | |
71 | int fclose(FILE *stream) | |
72 | { | |
73 | return _lttng_ust_fd_libc_fclose(stream); | |
74 | } | |
75 | ||
95e6d268 MD |
76 | #if defined(__sun__) || defined(__FreeBSD__) |
77 | /* Solaris and FreeBSD. */ | |
78 | void closefrom(int lowfd) | |
79 | { | |
80 | (void) lttng_ust_safe_closefrom(lowfd, __lttng_ust_fd_plibc_close); | |
81 | } | |
82 | #elif defined(__NetBSD__) || defined(__OpenBSD__) | |
83 | /* NetBSD and OpenBSD. */ | |
84 | int closefrom(int lowfd) | |
85 | { | |
86 | return lttng_ust_safe_closefrom(lowfd, __lttng_ust_fd_plibc_close); | |
87 | } | |
88 | #else | |
89 | /* As far as we know, this OS does not implement closefrom. */ | |
90 | #endif |